<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
     <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
     <el-breadcrumb-item>商品管理</el-breadcrumb-item>
     <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片区域 -->
    <el-card>
      <!-- 头部的警告区域 -->
      <el-alert show-icon title="注意:只允许为第三级分类设置相关参数" type="warning" :closable="false"></el-alert>

      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader v-model="selectedCateKeys" :options="cateList" :props="cateProps" @change="handleChange"></el-cascader>
        </el-col>
      </el-row>

      <!-- tab 页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleClick">
        <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
          <!-- 添加参数的按钮 -->
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染 tag 标签 -->
                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">
                  {{item}}
                </el-tag>
                <!-- 输入的文本框 -->
                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>

              </template>
            </el-table-column>
            <!-- 索引号 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <!-- eslint-disable -->
            <template slot-scope="scope">
              <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
              <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
            </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
          <!-- 添加属性的按钮 -->
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
          <!-- 静态属性表格 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染 tag 标签 -->
                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">
                  {{item}}
                </el-tag>
                <!-- 输入的文本框 -->
                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>

              </template>
            </el-table-column>
            <!-- 索引号 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
            <!-- eslint-disable -->
            <template slot-scope="scope">
              <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
              <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
            </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog :title="'添加'+titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
      <!-- 添加参数的表单 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
</el-dialog>

<!-- 修改参数的对话框 -->
    <el-dialog :title="'修改'+titleText" :visible.sync="editDialogVisible" @close="editDialogClosed" width="50%">
      <!-- 修改参数的表单 -->
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 商品分类列表
      cateList:[],
      // 级联选择框的配置对象
      cateProps:{
        value:'cat_id',
        label:'cat_name',
        children:'children'
      },
      // 级联选择框双向绑定到的数组
      selectedCateKeys:[],
      // 被激活的页签的名称
      activeName:'many',
      // 动态参数的数据
      manyTableData:[],
      // 静态属性的数据
      onlyTableData:[],
      // 控制添加对话框的显示与隐藏
      addDialogVisible: false,
      // 添加参数的表单数据对象
      addForm:{
        attr_name:''
      },
      // 添加表单的验证规则对象
      addFormRules:{
        attr_name:[
          { required: true, message: '请输入参数名称', trigger:'blur'}
        ]
      },
      // 控制修改对话框的显示与隐藏
      editDialogVisible: false,
      // 修改的表单数据对象
      editForm: {},
      // 修改表单的验证规制对象
      editFormRules:{
        attr_name:[
          { required: true, message: '请输入参数名称', trigger:'blur'}
        ]
      },
      // // 控制按钮与文本框的切换显示
      // inputVisible: false,
      // // 文本框输入的内容
      // inputValue: ''
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    // 文本框失去焦点或按下enter键都会触发
    async handleInputConfirm(row){
      if(row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      // 如果没有return,则证明输入的内容。需要添加
      row.attr_vals.push(row.inputValue.trim())

      row.inputValue = ''
      row.inputVisible = false

      this.saveAttrVals(row)
      // // 发起网络请求，保存到数据库中
      // const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
      // {attr_name: row.attr_name, attr_sel: row.attr_sel, attr_vals:row.attr_vals.join(' ')})

      // if(res.meta.status !== 200) {
      //   return this.$message.error('修改参数失败')
      // }

      // this.$message.success('修改参数成功')
    },
    // 点击按钮，展示文本输入框
    showInput(row){
      row.inputVisible = true
    },
    // 获取所有的商品分类
    async getCateList(){
      const {data:res} = await this.$http.get('categories')
      if(res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败！')
      }

      this.cateList = res.data
      // console.log(this.cateList);
    },
    // 级联选择框选中框，会触发这个函数
    handleChange(){
      this.getParamsData()

    },
    // 获取参数的列表数据
    async getParamsData() {
      // 证明选中的不是三级分类
      if(this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }

      // 证明选中的是三级分类
      console.log(this.selectedCateKeys);
      // 根据所选分类的id，和当前所处的面板，获取对应的参数
      const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes`, { params:{sel:this.activeName}})

      if(res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败')
      }

      
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 控制文本框的显示与隐藏
        item.inputVisible = false
        // 文本框中输入的值
        item.inputValue = ''
      })
      console.log(res.data)

      if(this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // tab 页签点击事件的处理函数
    handleClick(){
      // console.log(this.activeName);
      this.getParamsData()
    },
    // 监听对话框的关闭事件
    addDialogClosed(){  
      this.$refs.addFormRef.resetFields()
    },
    // 点击按钮，添加参数
    addParams(){
      this.$refs.addFormRef.validate(async valid => {
        if(!valid) return
        const {data:res} =await this.$http.post(`categories/${this.cateId}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })
        if(res.meta.status !== 201) {
          return this.$message.error('添加参数失败')
        }

        this.$message.success('添加参数成功')
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    // 点击按钮，展示修改的对话框 
    async showEditDialog(attr_id){
      const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,
      { params :{ attr_sel: this.activeName}})

      if(res.meta.status !== 200) {
        return this.$message.error('获取参数信息失败')
      }

      this.$message.success('获取参数信息成功')
      this.editForm = res.data
      this.editDialogVisible = true
    },
    // 重置修改的表单
    editDialogClosed(){
      this.$refs.editFormRef.resetFields()
    },
    // 点击按钮，修改参数信息
    editParams(){
      this.$refs.editFormRef.validate(async valid => {
        if(!valid) return
        const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{attr_name:this.editForm.attr_name, attr_sel:this.activeName})
        
        if(res.meta.status !== 200) {
          return this.$message.error('修改参数失败')
        }
        this.$message.success('修改参数成功')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    // 根据id删除对应的参数项
    async removeParams(attr_id){
      const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => err)

        if(confirmResult !== 'confirm') {
          return this.$message.info('用户已取消删除')
        }

        // 删除成功
        const {data:res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)

        if(res.meta.status !== 200) {
          return this.$message.error('删除参数失败')
        }
        
        this.$message.success('删除参数成功')
        this.getParamsData()
    },
    // 将对 attr_vals 的操作，保存到数据库
    async saveAttrVals(row){
      // 发起网络请求，保存到数据库中
      const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
      {attr_name: row.attr_name, attr_sel: row.attr_sel, attr_vals:row.attr_vals.join(' ')})

      if(res.meta.status !== 200) {
        return this.$message.error('修改参数失败')
      }

      this.$message.success('修改参数成功')
    },
    // 删除对应的参数可选项
    handleClose(i,row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    }

  },
  computed:{
    // 如果按钮需要被禁用，则返回true，否则返回false
    isBtnDisabled(){
      if(this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    // 当前选中的三级分类的id
    cateId(){
      if(this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    // 动态计算标题的文本
    titleText(){
      if(this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    },
    
  }
}
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}
.el-tag {
  margin: 10px;
}
.input-new-tag {
  width: 120px;
}
</style>